"Sorry to hear about your tomatoes. It's late to move them, and you would be taking soil that is problematic when you dig them up. You could take some tip cuttings, root them in water and plant them in a new area, but it will take them a while to grow large enough to bear fruit.
Yes, you can eat the tomatoes. The black walnut inhibits the tomato plant's growth, but it doesn't make them poisonous to eat. They may not taste as good as you'd like them too, since the plant is so stressed."